... 35,40CrMo,SCM435,10B38...Stainless steel is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum ... . We are a professional manufacturer with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so ... on .2. Our company had good reputation with customers from American,Europe ...